Yesterday one of mine customers asked me for solution, for easy way for different people to upload and download larger files, and customer had an option to create user roles.
My first idea is to buy cheap VPS from Digital Ocean, set up vsftpd, and add some web interface for user management.
For $5 I can get 20GB disk space, so I will try soon to realise this idea, and see how it's gona work.
For file upload we could use WinSCP.